Flow characteristics of a hydraulic cone-throttle valve during cavitation

Zhang, Jian

doi:10.1108/ilt-10-2018-0394

Cited by 10 publications

(4 citation statements)

References 10 publications

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“…Viscosity is a measure of an oil thickness and ability to flow at certain temperatures, while viscosity index is a lubricating oil quality indicator, an arbitrary measure for the change of its kinematic viscosity with temperature and provides an insight into the oil's ability to perform at high and low temperatures (1)(2)(3)(10)(11)(12) .…”

Section: Resultsmentioning

confidence: 99%

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Some Methods for Determining the Viscosity Index of Hydraulic Oil

Stanciu¹

2023

IJST

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Objectives: To determine the viscosity index of hydraulic oil by three methods. These methods are: the viscosity index determined by a mathematical relationship, using a calculation program and the graphic method. The study also intends to determine the viscosity-temperature coefficient for the hydraulic oil. Methods: To determine the kinematic viscosity of the hydraulic oil, we used a calculation formula that transforms the dynamic viscosity into kinetic viscosity knowing the density of the fluid. Thus, we determined the dynamic viscosity of the hydraulic oil with the Schott Ubbelohde viscometer at the temperatures of 40 and 100 • C. To determine the dynamic viscosity of hydraulic oil at 40 • C and 100 • C, we used a water bath. The dynamic viscosity thus obtained was transformed into the kinematic viscosity of the oil by dividing it by density. Findings: The lowest viscosity index of the hydraulic oil determined using the computer program is 101. The viscosity index of the hydraulic oil determined with relation ( 1) is 58% higher than using the computer program. The viscosity index determined by the graphic method is 50% higher than the one determined by the computer program. The viscositytemperature coefficient has a value of 0.8380. Novelty: Knowing the viscosity index of hydraulic oil is important for starting the engine at high temperatures and at low temperatures. At high temperatures, the oil chemically degrades and the molecules break down. The properties of hydraulic oils depend a lot on the way the hydraulic system works and the limits imposed on them in different conditions.

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Section: Resultsmentioning

confidence: 99%

“…The viscosity indices were also determined using the ASTM D 341 diagram, shown in Another indication of the change in kinematics viscosity with temperature, which is less arbitrary than the viscosity index, is the viscosity-temperature coefficient, VTC, defined by the relationship (1)(2)(3)11,12) V TC…”

Section: Methodsmentioning

confidence: 99%

Some Methods for Determining the Viscosity Index of Hydraulic Oil

Stanciu¹

2023

IJST

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“…The cavitation pressures calculated according to the molecular dynamics results were compared with the predictions produced using an existing mathematical model, and good agreement was obtained. Zhang et al [9] conducted experimental studies to visualize the evolution of cavitation bubbles near the wall using a nanosecond-micron space-time resolution laser photogrammetry system. They analyzed the morphological characteristics of cavitation bubble collapse at specific times and calculated the collapsed cavitation bubbles near the solid wall using the open FOAM program.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Zhang,

Hu,

Yin

et al. 2024

Processes

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Butterfly valves are widely used in the pipeline transportation industry due to their safety and reliability, as well as their low manufacturing and operation costs. Cavitation is a common phenomenon in the butterfly valve that can lead to serious damage to a valve’s components. Therefore, it is important to investigate the generation and evolution of cavitation in butterfly valves. In this study, LES and the Zwart model were used as the turbulence and cavitation models, respectively, to simulate cavitation through a butterfly valve. The influence of the valve opening degree and inlet flow velocity on dynamic cavitation through the butterfly valve were studied. Furthermore, the cavitated flow field was examined, along with the performance coefficients of the butterfly valve. With the increase in the incoming flow velocity, the high-speed jet zone over a large-range and low-pressure zone appeared inside the downstream of butterfly valve, which affected its stability and the cavitation generation through the valve. Furthermore, the flow coefficient decreased with the increase in vapor volume. In addition, the results indicated that cavitation was more easily induced for smaller valve opening degrees, and the interaction between cavitation and solid walls was stronger. Due to the existence of cavitation, the flow characteristics of butterfly valves are seriously affected.

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“…Jin et al [31] numerically analyzed the cavitating flow in microchannels and the effects of the diameter ratio and pressure drop were discussed. Zhang [32] studied the flow characteristics of a cone throttle valve under cavitation, and the cavitation luminescence was used to help relative experiments. Yuan et al [33] compared the compressible and incompressible method, and their results showed that the compressible method could provide more precise results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Methodologies for Cavitation Suppression Inside Globe Valves

Li¹,

Gao

Wu³

et al. 2020

Applied Sciences

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Cavitation inside globe valves, which is a common phenomenon if there is a high-pressure drop, is numerically investigated in this study. Firstly, the cavitation phenomenon in globe valves with a different number of cages is compared. When there is no valve cage, cavitation mainly appears at the valve seat, the bottom of the valve core, and the downstream pipelines. By installing a valve cage, cavitation bubbles can be restricted around the valve cage protecting the valve body from being damaged. Secondly, the effects of the outlet pressure, the working temperature, and the installation angle of two valve cages in a two-cage globe valve are studied to find out the best method to suppress cavitation, and cavitation number is utilized to evaluate cavitation intensity. Results show that cavitation intensity inside globe valves can be reduced by increasing the valve outlet pressure, decreasing the working temperature, or increasing the installation angle. Results suggest that increasing the outlet pressure is the most efficient way to suppress cavitation intensity in a globe valve, and the working temperature has a minimal effect on cavitation intensity.

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Flow characteristics of a hydraulic cone-throttle valve during cavitation

Cited by 10 publications

References 10 publications

Some Methods for Determining the Viscosity Index of Hydraulic Oil

Some Methods for Determining the Viscosity Index of Hydraulic Oil

Numerical Study of Cavitation Characteristics through Butterfly Valve under Different Regulation Conditions

Numerical Investigation of Methodologies for Cavitation Suppression Inside Globe Valves

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